When outdoor smoke reaches a home, the obvious response is to close the windows. Renovation planning needs to go further. Air also moves through imperfect seals, service penetrations and mechanical systems, while people still need ventilation, manageable indoor temperatures and a way to enter and leave the building.
A useful smoke-reduction brief therefore describes how the home should operate during periods of unsuitable outdoor air. It identifies avoidable entry paths, preserves necessary building functions and sets out the limits of filtration and temporary closed-window operation. The result should be an understandable operating arrangement supported by coordinated building work.
Define the problem you are trying to reduce
Describe the smoke events that prompted the renovation. Occasional regional bushfire smoke is different from recurring smoke associated with a nearby source. Record affected rooms, approximate timing, prevailing conditions and whether particular fans or cooling systems were operating. Observations help the assessor investigate, but they do not establish the pollutant mixture or identify a source conclusively.
Separate smoke exposure from direct bushfire attack. Improving resistance to outdoor smoke entry does not make a house a bushfire refuge, establish a Bushfire Attack Level or replace emergency advice. If the property also needs a bushfire assessment, commission that as a coordinated but distinct part of the project.
Consider whether the goal is to improve the entire home or provide one more manageable room during an event. A room approach may be easier to achieve in a constrained renovation, but it needs a realistic occupancy and access plan. Avoid allowing the phrase smoke-proof room into a brief unless the consultant immediately explains why that absolute promise is inappropriate.
Document the household’s operating constraints
Some households cannot keep doors closed for long because people move between inside and outside frequently. Others need cooling during smoky weather or have occupants with particular respiratory needs. Provide those facts before the consultant specifies a solution; they can materially change the proposal.
Give the assessor a focused checklist
- Rooms used for sleeping and extended daytime occupancy.
- Existing heating, cooling, exhaust and ventilation equipment.
- Doors connecting the home to garages or enclosed service areas.
- Windows and doors that are difficult to close or latch.
- Known draughts and building work that recently disturbed seals.
- Household needs during a simultaneous hot-weather event.
Commission an air-entry assessment
Ask a suitably qualified building or building-performance professional to investigate the likely routes. A visual inspection can identify damaged seals and obvious gaps. Depending on the property and project, additional diagnostic testing may help distinguish a few significant problems from many dispersed leakage paths.
Your Home’s Ventilation and airtightness guidance distinguishes deliberate ventilation from unintended air leakage. That distinction is central to this renovation. The assessor should identify which openings can be improved and which serve a necessary function, rather than issuing a blanket instruction to fill every gap.
Discuss what any proposed test can show. An airtightness test characterises the building under defined test conditions; it does not reproduce every wind pattern or directly certify protection from smoke. The report should explain the method, the areas included and how findings inform the renovation scope.
Include interfaces between trades. A new exhaust duct through the ceiling, a replacement window or recent electrical work can create a route that was absent from an earlier assessment. If these works are planned, the air-entry review should inform their detailing and be checked again when they are complete.
Repair operation before adding seals
Window and door hardware matters. A sash that no longer aligns with its frame may require adjustment or repair before an additional seal can work consistently. A door closer that leaves the door slightly ajar defeats the intention of perimeter improvements.
Ask the window or door contractor to assess the complete assembly: frame condition, moving components, existing seals, drainage and the junction to the surrounding wall. A narrow product quotation for replacement weather strips may miss a damaged frame or an unsealed installation gap.
Any proposed seal must suit the movement and material of the opening. It should not make the handle difficult to operate, prevent full latching or obstruct drainage paths. Confirm how the contractor will test operation after installation and whether replacement parts remain available.
Older windows may need a choice between targeted repair and replacement. Compare the actual improvement sought, the condition of the retained frame and the extent of surrounding disturbance. A new window is not automatically a complete answer if the connection between its frame and the wall is poorly resolved.
Coordinate concealed junctions and penetrations
Air can reach a room through construction cavities rather than a visible external opening directly beside the draught. Give the assessor access to relevant plans and renovation history. This may prevent money being spent repeatedly on a surface symptom while an important connection remains untreated.
Where walls or ceilings will be opened, ask for suitable air-control details before lining work is priced. The specification should identify compatible products and the responsibility for continuity around new services. Photographs of completed work are useful where the detail becomes inaccessible after plastering.
Do not ask a painter to improvise seals around electrical components or heat-producing equipment. Relevant trades need to preserve service access, required clearances and safe operation. Similarly, insulation, membranes and sealants need to be suitable for the construction and local moisture conditions.
Subfloor ventilation, wall drainage, roof ventilation and combustion-air provisions are not interchangeable with room draughts. Their roles must be assessed before anything is altered. A smoke-entry project should not create hidden moisture damage or interfere with appliance safety in pursuit of a tidier appearance.
Audit mechanical systems individually
Make a schedule of every system that moves air: bathroom and laundry exhausts, range hood, ducted heating or cooling, evaporative cooling, dedicated ventilation and any whole-house fan. Record whether it supplies outdoor air, extracts indoor air, recirculates air or combines those functions.
Do not infer the operating mode from the word air conditioner. Ask the service provider to explain the actual equipment and controls installed. If a system has an outdoor-air setting, establish whether and how that can be adjusted under manufacturer guidance during poor outdoor conditions.
For more detail on this part of the project, see Moving an Air Conditioner During Renovation: Reuse or Replace?.
For proposed ventilation upgrades, require a specific smoke-event operating strategy. The designer should explain the relationship between outdoor-air supply, filtration, exhaust, indoor pollutants and occupancy. A generic instruction to turn everything off for an indefinite period is not a complete design.
Check return-air and supply-air routes if rooms are intended to remain closed. A system may depend on a particular door position or transfer route. The solution must preserve its designed operation, especially where concentrating people in a single room changes the normal occupancy pattern.
Keep indoor sources in the plan
NSW Health’s Indoor air pollution guidance identifies both outside and inside sources and cautions against ozone generators for indoor pollution or odour control. Closing a home against smoke does not remove pollutants produced inside it.
Use the renovation to examine activities and equipment that add to the indoor burden. Cooking arrangements, attached-garage separation and the choice of heating appliances may warrant attention. Any alteration involving gas appliances, flues or required ventilation needs advice from appropriately qualified professionals.
Consider the timing of fresh finishes and furniture. A newly painted room with new flooring and closed windows may be a poor place to concentrate the household immediately after renovation. Plan curing, cleaning and suitable ventilation before that room is needed for prolonged occupancy.
Ask the designer how moisture-producing activities will be handled during a smoke event. Bathrooms and kitchens still need a workable arrangement. The operating guide should make the relevant decisions explicit, rather than leave household members choosing between a smoky room and an unexplained instruction to stop using exhaust fans.
For more detail on this part of the project, see Bathroom Exhaust Fans: Sizing, Ducting and Condensation Control.
Specify filtration by its actual purpose
Filtration may complement the building work, but it should have its own performance brief. Identify the rooms served, the pollutants the equipment is intended to address and the operating conditions needed. An ordinary mesh filter fitted to cooling equipment should not be assumed to provide the performance of a purpose-selected fine-particle filter.
Ask for evidence for the exact equipment and replacement filter combination. The type of filter, the airflow available through it and the installation arrangement all matter. A impressive filter-media claim does not by itself establish the result throughout an occupied room.
Portable equipment requires usable floor space and a safe power location. Built-in equipment requires service access and a design that accounts for the resistance of the selected filters. In either case, include replacement-filter availability, cleaning responsibilities and likely noise during the intended operating mode.
Have the supplier state limitations plainly. Particle filtration is not a blanket solution for every gas or hazard associated with smoke, and it does not supply all the functions of ventilation. Avoid proposals that promise complete protection without specifying what has actually been tested.
Resolve heat, access and power together
Smoke can coincide with hot weather. If the plan depends on closed windows, ask how the occupied rooms will remain manageable. Shading, the room envelope and suitable cooling may need to be coordinated with the air-entry work rather than treated as a later comfort upgrade.
Check entry routines. A heavily used external door near the intended cleaner room may be difficult to manage. The renovation might improve a lobby, closer or internal separation, but any door changes must preserve safe exit and accessibility. Household routines can support the arrangement without turning everyday access into an obstacle course.
Document what stops working during an electricity interruption. Filtration and mechanical cooling commonly depend on power. If backup is proposed, a licensed electrical professional should assess the actual loads and circuits. Equipment should not be plugged into improvised power arrangements to maintain a promise the system was never designed to deliver.
The household also needs an alternative plan if conditions remain unsuitable. Follow local health and emergency advice and seek individual medical guidance where appropriate. An indoor monitor or reduced smoke odour should not overrule symptoms, an evacuation direction or other relevant official advice.
Make the quotation boundaries clear
Divide the quotation into investigation, building repairs, air-control work, mechanical changes and verification. This exposes gaps between contractors and allows the household to compare equivalent work. Ask who will coordinate the final operating strategy when several trades contribute.
For a hypothetical project, replacing worn door seals may be straightforward while a ceiling junction can only be reached during planned relining. The sensible sequence is to inspect and detail the concealed work first, then complete accessible adjustments as part of handover. The sequence should follow the building’s access constraints.
Request current project prices in AUD with GST treatment and exclusions identified. Include making good, access equipment, test visits and any commissioning that the proposed result depends on. A lower quote that omits system review may not address the same problem as a coordinated package.
State how variations will be handled if inspection finds damaged frames, unsafe services or materials requiring specialist assessment. The goal is not to remove every uncertainty before work begins, but to prevent unclear discoveries from becoming unapproved improvisation.
Verify the finished arrangement
At handover, check every altered opening and ask relevant contractors to demonstrate equipment modes. Review the final mechanical-system schedule against what was actually installed. Ensure that product substitutions did not change filter compatibility, noise or maintenance access.
Where repeat testing was part of the scope, obtain the results and an explanation of remaining leakage. Keep the report with photographs, product schedules and the operating guide. Those records allow future renovation work to preserve the improvements.
Use a later smoke event to review practical performance without treating it as a controlled laboratory trial. Record door use, equipment settings, indoor activities and observed difficulties. If monitoring is included, ask a competent adviser how to interpret the device’s limitations and the difference between local outdoor data and indoor readings.
A successful renovation leaves the household with a more controllable home and a clear understanding of what to do when outdoor air deteriorates. Its value lies in coordinated reduction measures and realistic limits, supported by equipment and building details that can be maintained over time.
Sources consulted: Your Home, Ventilation and airtightness; NSW Health, Indoor air pollution.